https://myportal.vtc.edu.hk/*

try to take over the world!

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

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You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

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// ==UserScript==
// @name         https://myportal.vtc.edu.hk/*
// @namespace    https://greasyfork.org/en/scripts/375225-https-myportal-vtc-edu-hk
// @icon         https://www.google.com/s2/favicons?domain=myportal.vtc.edu.hk
// @version      0.6
// @description  try to take over the world!
// @author       You
// @match        https://myportal.vtc.edu.hk/*
// @require      https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js
// @require      https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.min.js
// @supportURL   https://github.com/admin-ll55/
// @grant        none
// ==/UserScript==
$(document).ready(function(){
  var absent = 0;
  var attend = 0;
  if ($("table.hkvtcsp_wording").length > 0) {
    $("table.hkvtcsp_wording tbody td:last-child").each(function(){
      if ($(this).prev().prev().text() != '-') {
        var a = $(this).prev().prev().text();
        var b = $(this).prev().text().substring(0,5);
        a = moment(a, "kk:mm");
        b = moment(b, "kk:mm");
        var diff = a.diff(b, 'minutes');
        if (diff < 1) {
            diff = 0;
        }
        //$(this).text(diff);
        $(this).after(`<td style="text-align:center">`+diff+`</td>`);
        absent += diff;
      } else {
        var a = $(this).prev().text().substring(0,5);
        var b = $(this).prev().text().substring(8,13);
        a = moment(a, "kk:mm");
        b = moment(b, "kk:mm");
        var diff = b.diff(a, 'minutes');
        //$(this).text(diff);
        $(this).after(`<td style="text-align:center">`+diff+`</td>`);
        absent += diff;
      }
      a = $(this).prev().text().substring(0,5);
      b = $(this).prev().text().substring(8,13);
      a = moment(a, "kk:mm");
      b = moment(b, "kk:mm");
      attend += b.diff(a, 'minutes') - $(this).next().text();
    });
    $("table.hkvtcsp_wording").before(`<script>var attend = `+attend/60+`, absent = `+absent/60+`;function update_per(){$('#allowance').html($('#contact_hours').val()*0.3);$('#tolerance').html($('#contact_hours').val()*0.3-absent)}</script>`).append(`<tr><td style="text-align:center">total:</td><td style="text-align:center">`+(attend/60+absent/60)+`</td><td style="text-align:center">attend:</td><td style="text-align:center" id='attend'></td><td style="text-align:center">absent:</td><td style="text-align:center" id='absent'></td></tr><tr><td style="text-align:center">contact hours:</td><td style="text-align:center"><select id='contact_hours' onchange='update_per();'><option>13</option><option>26</option><option>39</option><option>52</option><option>78</option></select></td><td style="text-align:center">allowance:</td><td style="text-align:center" id='allowance'></td><td style="text-align:center">tolerance:</td><td style="text-align:center" id='tolerance'></td></tr>`).after(`<script>$('#attend').html(attend);$('#absent').html(absent);$('#allowance').html($('#contact_hours').val()*0.3);</script>`);
  }
  if (($("li:contains('Activity Enrolment')").length > 0) && ($("img[src*='current/EN/search_activity']").length > 0)) {
    var table = $("th.hkvtcsp_theader").parent().parent().parent();
    var target = table.find("td:contains('Yes')");
    var temp = "";
    target.each(function(){
      temp += $(this).parent().get(0).outerHTML;
      $(this).parent().remove();
    })
    table.find("tbody").append(temp);
  }
});